Abstract
All five noble gases in interstellar silicon carbide grains have grossly non-solar isotopic and elemental abundances that vary with grain size but are strikingly similar to calculated values for the helium-burning shell of low-mass carbon stars. Apparently these grains formed in carbon-star envelopes, and were impregnated with noble gas ions from a stellar wind. Meteoritic SiC provides a detailed record of nuclear and chemical processes in carbon stars.
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Lewis, R., Amari, S. & Anders, E. Meteoritic silicon carbide: pristine material from carbon stars. Nature 348, 293–298 (1990). https://doi.org/10.1038/348293a0
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DOI: https://doi.org/10.1038/348293a0
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